A Study on Gas Pressure Fluctuation Characteristics inside the Snubber and Pipe of Hydrogen

Abstract

Hydrogen fuel cell is a developing technology that allows great amount of electrical power to be obtained using a source of hydrogen gas. It is a proven environment-friendly potential future fuel. During compression of hydrogen gas in reciprocating compressor, pressure fluctuation is built up. The pressure fluctuation and its reduction by the snubber are studied in this experiment. For different motor frequencies, the input and output pressure amplitude varies from 0.228 kPa-2.081 kPa and 0.095 kPa-0.898 kPa. The pressure magnitudes are 101.451-105.172 kPa and 101.388-102.565 kPa for input and output of the snubber, respectively. The acryl snubber reduces 0.796 kPa (57.31%) pressure amplitude on average with restoring its high pressure. Detail information about the pressure including the critical pressure zone inside the tube like snubber part and the whole system can be obtained by CFD.

A theoretical analysis of temperature rise of hydrogen in high-pressure storage cylinder during fast filling process

“…Rayleigh number of the gas P pressure of the gas (MPa) P i settled pressure in the tank (MPa) P 1 initial pressure (MPa) P 2 final pressure in the tank (MPa) T temperature of the gas (K) T 1 initial temperature (K) T i the temperature of inlet gas (K)…”

“…Therefore, countries in the world have paid close attention to the development of new energy sources in recent years. [1][2][3][4][5] Among them, hydrogen energy is favored for its clean, pollution-free, high efficiency, and other advantages. As a clean and efficient energy source with zero emission of greenhouse gases, hydrogen is considered to be an important energy source that can be used to replace traditional fuels.…”